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A non-uniform gradient cemented carbide and its preparation method

A hard alloy, non-uniform technology, applied in the field of powder metallurgy, can solve the problems of increased solubility of fine WC, difficulty in controlling the particle size and proportion of fine WC, insufficient wear resistance, etc., to achieve superior performance, excellent edge strength and impact resistance The effect of performance, good toughness and strength

Active Publication Date: 2017-11-14
ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, non-uniform gradient cemented carbide cannot be realized by simply combining the two existing technologies of non-uniform alloy and gradient cemented carbide. On the one hand, the existing non-uniform gradient cemented carbide is mainly used for mining tools, milling tools, etc. In the field of metal turning, which requires high wear resistance and high temperature plastic deformation resistance, this structure obviously has the disadvantage of insufficient wear resistance. It is also difficult to realize the bimodal particle size distribution of WC grains in the process, because the fine WC powder is preferentially dissolved and precipitated during the sintering process, especially after the high cubic phase compound is added, WC will dissolve into it, so the fine WC Solubility will increase further, making it difficult to control fine WC particle size and ratio

Method used

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  • A non-uniform gradient cemented carbide and its preparation method
  • A non-uniform gradient cemented carbide and its preparation method
  • A non-uniform gradient cemented carbide and its preparation method

Examples

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Embodiment 1

[0045] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is with 8wt.% Co as binder phase, with 92wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein the content of the titanium-containing cubic phase compound is 3.4wt.%, and the specific composition of the titanium-containing cubic phase compound is 2.0wt.% (Ti, W) C, wherein the W content is 45.2wt.%, and 0.4wt.% of TiC 0.5 N 0.5 , 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. Tungsten carbide (WC) grain distribution has a bimodal structure, one of which is 0.8 μm and the other is 2.8 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 10.0 μm. The average particle size of fine WC powder is 0.5 μm, and the mass ratio of fine WC powder to coarse WC powder is 0.3:1. In this example, the non-uniform gradient cemented carbide has a surfa...

Embodiment 2

[0057] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is with 8wt.% Co binding phase, with 92wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein The content of titanium-containing cubic phase compound is 3.4wt.%. 0.5 N 0.5 , 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. The grain distribution of tungsten carbide (WC) has a bimodal structure, one of which is 1.0 μm and the other is 2.5 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 8.0 μm. The average particle size of fine WC powder is 1.2 μm; the mass ratio of fine WC powder to coarse WC powder is 0.7:1. In this example, the non-uniform gradient cemented carbide has a surface gradient structure with titanium-containing cubic phase compounds missing, the average binder phase content of the surface gradient structure is 1.5 times...

Embodiment 3

[0069] A kind of non-uniform gradient cemented carbide of the present invention, in this embodiment non-uniform gradient cemented carbide is to use 6wt.% Co binding phase, with 94wt.% tungsten carbide and titanium-containing cubic phase compound as hard phase, wherein The content of titanium-containing cubic phase compound is 3.4wt.%, and its specific composition is 2.0wt.% (Ti, W) C, of ​​which W content is 51.3%, 0.4wt.% TiC 0.5 N 0.5, 1.0 wt.% (Ta, Nb)C, Ta / Nb mass ratio=3. Tungsten carbide (WC) grain distribution has a bimodal structure, one of which is 0.6 μm and the other is 1.9 μm. The original WC powder includes two different particle sizes, coarse and fine. The average particle size of coarse WC powder is 8.0 μm. The average particle size of fine WC powder is 0.8 μm; the mass ratio of fine WC powder and coarse WC powder is 0.8:1. In this example, the non-uniform gradient cemented carbide has a surface gradient structure with titanium-containing cubic phase compound ...

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Abstract

The invention discloses a non-uniform gradient cemented carbide and a preparation method thereof. The non-uniform gradient cemented carbide uses Co as a binder phase, tungsten carbide and a titanium-containing cubic phase compound as a hard phase, and a titanium-containing cubic phase compound. The mass fraction of the compound in the non-uniform gradient cemented carbide is 2wt.%~8wt.%. The grain distribution of tungsten carbide has a bimodal structure. The surface layer structure is missing from the titanium-containing cubic phase compound that is 1 to 2 times the nominal binder phase content. The preparation method includes batching, mixing powder, pressing and sintering. The non-uniform gradient cemented carbide of the present invention has higher hardness, toughness and bending strength, can meet the requirements of processing metal materials such as cast iron, alloy steel, stainless steel, etc., and has a simple preparation method and low cost.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a non-uniform gradient cemented carbide and a preparation method thereof, in particular to a cemented carbide with a non-uniform WC particle size distribution and a cubic phase gradient structure on the surface and a preparation method thereof. Background technique [0002] Surface lack of cubic phase (also known as de-β layer) gradient structure cemented carbide refers to adding a certain amount of cubic phase to the raw material powder, such as TiC, TiN or solid solution carbide (Ti, W) C, (Ta, Nb) C Or solid solution carbonitride (Ti, W) (C, N), (Ti, Ta, Nb) (C, N), TiCN, etc., the raw material powder is ball milled and mixed, and pressed into a green compact containing a cubic phase as a whole, after sintering In the stage, by changing the atmosphere in the furnace, a gradient layer of lacking cubic phase is formed on the surface of the substrate with a certain thickness. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05C22C1/10B22F3/10
CPCC22C1/051C22C29/005C22C29/08B22F3/101B22F2998/10B22F1/052B22F3/02B22F2009/043
Inventor 谢文左锐温光华陈响明王社权
Owner ZHUZHOU CEMENTED CARBIDE CUTTING TOOLS CO LTD
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